Sight glass



FIG. 1 is a perspective view of the sight glass of my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view of the right side thereof;

FIG. 5 is a side elevational view of the left side thereof;

FIG. 6 is atop plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for sight glass, as shown and described. 